Method of making margin stops for typewriting machines



2 Sheets-Sheet l B. J. DOWD May 8, 1934.

May 8, 1934, B JI Down 1,958,298

METHOD OF MAKING MARGIN STOPS FOR TYPEWRITING MACHINES Filed June 2, 1953 2 Sheets-Sheet 2 Patented May 8, 1934 Application June 2, 1933, Serial No. 674,065

5 Claims.

This invention relates to new and useful improvements in the method of forming margin stops for typewriters.

Among the several objects of the invention are to provide a margin stop with means for guiding both ends of the holding latch during relative longitudinal movements between the latch and the margin stop frame whereby the latch will properly cooperate with the teeth of the margin rack on which the stop is mounted, and to construct the various parts of the margin stop from sheet metal by a method which greatly reduces the number of operations heretofore employed in manufacturing margin stops and which therefore greatly reduces the cost of manufacture of such stops.

With these and other objects in view which will more fully appear, the nature of the invention will be more clearly understood by following the description, the appended claims, and the several views illustrated in the accompanying drawings.

In the drawings:-

Figure l is a partial plan view of a typewriter carriage showing a margin rack and the right and left margin stops mounted thereon,

Figure 2 is a front elevation of the rack and margin stops, a part of the right hand stop being shown in section,

Figure 3 is a vertical cross sectional view taken on the line 3-3 of Figure 2,

Figure 4 is a similar view taken on the line 44 of Figure 2,

Figure 5 is a bottom plan view of the right hand stop showing the same mounted on the margin rack,

Figure 6 is a top plan view thereof,

Figure '7 is an enlarged top plan view of the left hand margin stop showing the same mounted on the margin rack,

Figure 3 is a View showing in separated perspective the various parts which form the left hand margin stop,

Figure 9 is a perspective view of a blank which is formed into the frame of the left hand margin stop,

Figure 10 is a similar view of a blank which is formed into the frame of the right hand margin stop and showing the first step in the method of forming the frame,

Figure 11 is a perspective view showing the second step in the method of forming the frame,

Figure 12 is a perspective view showing the third step in the method of forming the frame,

Figure 13 is a perspective view showing the fourth step in the method of forming the frame,

Figure 1% is a perspective view showing the fifth step in the method of form'mg the frame,

Figure 15 is a perspective view showing the sixth step in the method of forming the frame,

Figure 16 is a perspective view showing the seventh step in the method of forming the frame, and

Figure 1''! is a perspective view showing the eighth step in the method of forming the frame.

Like reference numerals designate corresponding parts throughout the several figures of the drawings.

Referring to the accompanying drawings, I have shown my improved left hand margin stop X and right hand margin stop Y as being applied to a typewriter carriage which includes end plates 5, 5, the'platen 6, and a margin rack 7 which extends between the end plates and on which the margin stops are mounted. This margin rack 7 includes the usual teeth 8 on its upper surface and a scale 9 on its front surface. A center stop 1G is located in rear of the margin rack! and is supported by the main frame of the typeti'riter in the usual manner.

The left hand margin stop X comprises a rectangular frame a formed of sheet metal from the blank shown in Figure 9, and the right hand margin stop Y includes a frame I) which is formed from a blank of sheet metal shown in Figure 10. The frames and b are slidably mounted on the margin rack '7 for longitudinal adjustments therealong.

The frame a is, provided with an interiorly threaded loop 1]. for adjustably receiving a stop screw 12 which is adapted to engage the center stop 10 and thereby insure accurate carriage banking, and with a center stop camming lug 13. Slidable on the top of the frame a is a latch c which is also formed of sheet metal and is provided at one end with a fingerpiece 14 and at its other end with a downturned nose 15 for engaging the teeth 8 of the margin rack 7. The latch c is also provided adjacent the nose 15 with guide fingers or lugs 16, 16 which extend downwardly from the side edges of the latch. The fingers or lugs 16 assist in initially positioning the nose end of the latch laterally with respect to the frame a. The end of the latch c opposite the nose 15 and beyond the fingerpiece 14 is provided with a reduced extension or tail 1'7. A U-shaped fiat spring d is disposed between the frame a and the latch 0, one leg 18 of the spring lying flat against the top of the frame a and the other leg 18a be ing normally inclined and lying fiat against the gitudinally relative to the frame a.

underface of the latch c. The legs of the spring normally diverge away from the nose and thereby tend to throw the nose 15 of the latch downwardly into engagement with the teeth 8 of the margin rack. This spring is of sufficient width to be retained against lateral movement by the lugs or fingers 16, 16. The spring is retained against longitudinal movement relative to the frame a and latch c by means of a screw 19 which passes downwardly through a longitudinally extending opening 20 formed in the latch 0 between the lugs 16, 16 thereof, thence through openings 21, 22 respectively formed in the legs 18, 18a of the spring 11, and thence into a threaded opening 23 formed in the top of the frame a. It will therefore be observed that the spring constitutes a pivot for the latch, and that the screw 19 also serves to hold the latch and spring in proper cooperative relation on the frame.

Adjustably mounted on the right hand end of the frame a is a cam plate e which includes a base 24 having a longitudinally extending opening 25 formed in the left hand end thereof, and with guide lugs or ears 26, 26 which extend downwardly from the sides of the base adjacent the right hand end thereof for engagements with the sides of the frame a. Extending upwardly from the right hand end of this cam plate e are upwardly extending cam fingers 2'7, 27 which are curved toward the right, that is, away from the opening 25. These cam fingers 27 are spaced apart to receive the tail 17 of the latch c. The cam plate 6 is attached to the frame a by means of a screw 28 which passes through the elongated opening 25 in the cam plate and into a threaded opening 29 in the top of the frame a. When the latch c is depressed, the right hand end 17a thereof will engage the cam fingers 27 and thereby effect a relative longitudinal movement between the latch and the frame a. It will, therefore, be seen that the tail 17 has a sliding and interlocking connection with the cam fingers 2'7, and that by means of this connection together with the screw 19, the latch c is guided in a straight line when the same is bodily moved lon- By means of the elongated opening 25 and the screw 28, the cam plate e may be adjusted longitudinally on the frame a and clamped thereto in any adjusted position. Thus by varying the longitudinal position of the cam plate with respect to the frame a, the amount of relative longitudinal movement between the latch c and the frame may be correspondingly varied. Thus both ends of the latch c are positively guided when the latch is moved longitudinally with respect to the frame a, and that the spring 11 is retained against swinging movement about the screw 19 by means of the lugs 16 which cooperate with the side edges of the legs 18, 18a of said spring.

Adjustably mounted upon the latch c by means of a screw 30 is a pointer which is formed of sheet metal and extends downwardly along the front side of the frame a for cooperation with the scale 9 on the front face of the margin rack '7 to 'locate the margin stop along the margin rack.

In operation, when the latch c is raised, the right hand end thereof will engage the cam fingers 27 and cause the frame a to move longitudinally towards the right and relative to the latch. The entire stop X, with the latch in its raised position, is then moved along the margin rack 7 until the stop screw 12 is in contact with the center stop 10. The latch is then released so that the nose 15 will engage one of the teeth 8 of the margin rack. Thus, the stop screw 12 is set a predetermined distance away from the center stop, generally one letter space distance, for the reasons well known in the art.

The frame b of the right hand margin stop Y is identical in construction with the frame a of the left hand margin stop X, with the exception that the frame 2) is provided at its left hand end with upwardly extending guide fingers 31, 31 which are spaced apart and are integral with the top of said frame as clearly shown in Figure 17. The latch 0, spring (1 and pointer f are mounted on the frame 6 in the same manner as said parts are mounted on the frame (1, except that the latch is not mounted for longitudinal movement relative to the frame 12. Pivotally mounted on the rear wall of the frame b, is a bell trip pawl g which trips the bell hammer (not shown) when the carriage is moving in one direction and rides over the bell hammer when the carriage moves in the opposite direction.

From the foregoing, it will be observed that the frames a and b of the margin stops, the latches c, the springs d, the cam plate 6, the pointer ,f, and the bell trip pawl g, are all formed from sheet metal.

In forming the frame I) for the right hand margin stop Y, I first punch out a blank 71. from sheet metal stock, as shown in Figure 10. This blank includes a substantially rectangular body 32 which is formed at one side with a rectangular opening 33 forming resultant arms 34, 35, and at the other side with a substantially rectangular recess 33 which forms resultant arms 36 and 37,

the arms 34 and 36 being in alinement and the arms 35 and 37 being in alinement. Extending outwardly from the arm 36 is the center stop camming lug 13. Extending from the end of the body 32 on the side opposite the camming lug 13 are the spaced guide fingers 31, 31. The blank is then bent along the dotted line 38 which extends transversely across the body 32 and intermediate the arms 34, 35 and the arms 36, 3'7, as shown in Figure 11, and simultaneously with this operation the end portions of the arms 34, 35 are bent upwardly along the lines 39, 40 to form holding lugs 41, 41.

In forming the frame a for the left hand margin stop X, I first punch out a blank 2 from sheet metal stock, as shown in Figure 9. This blank is identical in construction as the blank 71. of Fig ure 10, except that it is devoid of the guide fingers 31 of said blank 71., and the subsequent operations which are performed on this blank 2' are identical with those performed on the blank h.

The next operation, as shown in Figure 12, consists in slightly bending rearwardly the free end of the arm 36 as shown at 42, and in bending forwardly the short arm 37 as at 3'7 to form a holding lug 43.

The next operation, as shown in Figure 13, consists in curling the end portion 42 of the arm 36 into the loop 11.

The next operation, as disclosed in Figure 14, consists in bending the arms 34, 35 upwardly along the transverse lines 44, 44 shown in Figure 10, thereby forming the top 45, the rear wall 46, the spaced front wall sections 47, 47 and the bottom holding lugs 41, 41, and 43.

In the next operation, as shown in Figure 15, the arm 36 together with the loop 11 and camming lug 13 are bent rearwardly along the transverse line 48 as shown in Figure 10.

The next operation, as shown in Figure 16, consists in bending the arm 36 downwardly along the line 49 shown in Figure 10 to position the loop 11 in direct contact with the rear wall 46. The guide fingers 31, 31 are then bent upwardly as shown in Figure 17 and the loop 11 is interiorly threaded as shown in said figure. The contacting surfaces of the loop 11 and the rear wall 46 are rigidly secured together by welding or brazing as indicated at 50.

From the foregoing, it will be observed that all the constructional operations in forming this margin stop, with the exception of the screw threadings and the one of welding or brazing are made on power presses.

I claim:

1. The method of forming sheet metal margin stops for typewriters, consisting in first punching a blank to form a rectangular body portion having an arm extending from one side thereof; and then bending said body portion into an open rectangular frame and bending the arm into a stop loop having its longitudinal axis disposed in parallelism with the longitudinal axis of the body portion.

2. The method of forming sheet metal margin stops for typewriters, consisting in first punching a blank to form a rectangular body portion having an arm extending from one side thereof; and then bending said body portion into an open rectangular frame and bending the arm into a stop loop, having its longitudinal axis disposed in par allelism with the longitudinal axis of the body portion and positioning said loop in contact with one wall of the frame.

3. The method of forming sheet metal margin stops for typewriters, consisting in first punching a blank to form a rectangular body portion having spaced guide fingers extending from one end thereof; and then bending said body portion into an open rectangular frame and bending the fingers upwardly and in a direction away from the end of the frame.

4. The method of forming sheet metal margin stops for typewriters, consisting in first punching a sheet metal blank to form a rectangular body portion including recesses in its opposite sides forming resultant pairs of arms extending in opposite directions, then bending the body portion transversely between said recesses to form a top and a rear wall for the frame and simultaneously bending the end portions of one pair of arms to form bottom guiding lugs; then slightly curving the end of one of the remaining arms preparatory to forming said arm into a stop loop and simultaneously bending the remaining arm to form a third bottom guiding lug; then bending the stop loop arm into a loop; then bending the first two mentioned arms to form front arms for the stop frame; then bending the loop arm outwardly away from the rear wall; and then bending the loop arm to position the loop in contact with the rear wall of the frame.

5. The method of forming sheet metal margin stops for typewriters, consisting in first punching a sheet metal blank to form a rectangular body portion including recesses in its opposite sides forming resultant pairs of arms extending in opposite directions, a camming nose extending from one end, and a pair of guide fingers extending from the other end; then bending the body portion transversely between said recesses to form a top and a rear wall for the frame and simultaneously bending the end portions of one pair of arms to form bottom guiding lugs; then slightly curving the end of one of the remaining arms preparatory to forming said arm into a stop loop and simultaneously bending the remaining arm to form a third bottom guiding lug; then bending the stop loop arm into a loop; then bending the rear wall of the frame; and finally bending f,

the guide fingers upwardly.

BERNARD J. DOWD. 

